Modesty Blaise is working as a croupier in a casino in Tangier. A group of violent criminals assassinate her employer and enter the casino shooting staff and demanding entry to the casino's safe. Modesty delays her retaliation and retribution as she protects the lives of her staff. When the criminals kill the only person who can open the safe, Modesty arranges for a fellow employee to arrive who has the password for the computer that holds the details of the entry to the vault. As the criminals and their captives await the individual, Modesty takes on the leader of the criminals at the game of roulette. They agree that if she wins twice in a row a captive sworn to not tell what happened is released; when she loses she has to tell the truth about her background to the leader of the criminals who has become fascinated by her. She relates her life story little by little in the manner of Scheherazade.